METHOD AND APPARATUS FOR ALTERING DEVICE APPEARANCE
A housing (100, 300, 600, 700) for storing and protecting items comprises a photoreactive material (106) that selectively and irreversibly changes colors upon exposure to activating radiation (124, 324); and an ultraviolet attenuation coating (102, 702) disposed over the photoreactive material (106). Radiation (124, 324) is selectively applied to the photoreactive material (106) to irreversibly change the color of the photoreactive material (106) and therefore the housing (100, 300, 600, 700). An optional patterned layer (332) may be disposed between the photoreactive material (106) and the selective application of radiation (124, 324), and a background color (108) may be included, to affect the visual presentation of the housing (100, 300, 600, 700).
Latest MOTOROLA, INC. Patents:
- Communication system and method for securely communicating a message between correspondents through an intermediary terminal
- LINK LAYER ASSISTED ROBUST HEADER COMPRESSION CONTEXT UPDATE MANAGEMENT
- RF TRANSMITTER AND METHOD OF OPERATION
- Substrate with embedded patterned capacitance
- Methods for Associating Objects on a Touch Screen Using Input Gestures
The present invention generally relates to the use of photoreactive compound materials, and more particularly to the use of photoreactive compound materials to irreversibly change the appearance of a housing for a variety of devices.
BACKGROUNDThe market for electronic devices, especially personal portable electronic devices, for example, cell phones, personal digital assistants (PDA's), digital cameras, and music playback devices (MP3), is very competitive. Manufactures are constantly improving their product with each model in an attempt to cut costs and to meet production requirements.
The look and feel of personal portable electronics devices is now a key product differentiator and one of the most significant reasons that consumers choose specific models. From a business standpoint, outstanding designs (form and appearance) may increase market share and margin.
Consumers are enamored with appearance features that reflect personal style and select personal portable electronics devices for some of the same reasons that they select clothing styles, clothing colors, and fashion accessories. Consumers desire the ability to change the appearance of their portable electronics devices (cell phones, MP3 players, etc.). Plastic snap-on covers for devices such as cell phones and MP3 players can be purchased in pre-defined patterns and colors. The types of electro-optical modules that one could affix or embed in a portable electronic device to enable a changing appearance are limited by a number of factors. Portable electronic devices must be particularly thin, robust, and low power. Sales of high volume consumer products are very sensitive to consumer preferences for design, functionality, and cost. These factors produce a narrow engineering window requiring unique solutions.
Accordingly, it is desirable to provide a method and apparatus for changing the appearance of a device housing. Furthermore, other desirable features and characteristics of the present invention will become apparent from the subsequent detailed description and the appended claims, taken in conjunction with the accompanying drawings and this background.
Embodiments of the present invention will hereinafter be described in conjunction with the following drawing figures, wherein like numerals denote like elements, and
The following detailed description is merely exemplary in nature and is not intended to limit the invention or the application and uses of the invention. Furthermore, there is no intention to be bound by any theory presented in the preceding background or the following detailed description.
Housings are used to contain or store, and protect, a wide variety of items or devices and typically are a rigid or flexible material of a specific color. The term “housing” generally refers to a material at least partially covering or surrounding an item, and may assume other names such as a “case”, for example. Items disposed within a housing range, for example, from keepsakes such as jewelry to electronic devices such as cell phones.
The housing described herein includes a transparent support layer, a photoreactive coating, a radiation attenuating material, an optional background color layer, an optional activating radiation source, and an optional patterning layer. The transparent support layer provides structure to the housing. The radiation attenuating material, transparent to visible light, absorbs radiation, such as ultraviolet (UV) from sunlight, and prevents the unintentional changing of the color of the photochromic coating and degradation of the other layers beneath. The radiation attenuating material may be referred to as a blocking material when the UV radiation is substantially prevented from passing there through. When a slow color or design change is preferred, such as developing of patina effect, the UV blocking ability or efficiency can be engineered to allow, or attenuate, a limited amount of UV to reach the photoreactive layer to slowly activate the process. The photoreactive coating may be photochromic ink of a solution of a 1,2-dihydroquinoline (DHQ) in a polymer solution that irreversibly changes color when exposed to activating radiation such as UV radiation. The photoreactive material may also be a photosensitive layer containing silver oxalate and mercury(I) and/or mercury(II) oxalate. Another example is pyrrole derivatives, such as 2-phenyl-di(2-pyrrole)methane, which becomes irreversibly red upon UV light exposure. The photoreactive coating may originally comprise a color or be clear, and is changed to a color, or from a color to clear, upon the application of radiation. As used herein when referring to the photoreactive coating, the word “color” includes a visible color or no visible color (clear). The optional background color layer provides an initial color to the housing, and may be a partially reflective layer of metallization. The background color may be provided alternatively by the transparent support layer or may be omitted altogether when a transparent housing is desired (for displaying objects within the housing). The radiation source may be for example, a light emitting diode (LED), which emits light at specific wavelengths, for example ultraviolet or fluorescent black light, that activate the color changing process of the photoractive compounds. While UV radiation is preferred, other wavelengths may be used.
Referring to
The photoreactive coating 106 is a material of dye molecules that initially assumes a first color, then irreversibly changes to a second color upon the application of activating radiation. The second color remains when the activating radiation is removed. This material is, for example, preferably a matrix of 1,2-dihydroquinoline (DQH) in polymer (See U.S. Pat. No. 4,812,171) or other materials such as a photosensitive layer containing silver oxalate and mercury(I) and/or mercury(II) oxalates, pyrrole derivatives, such as 2-phenyl-di(2-pyrrole)methane.
An transparent colored layer 108 is disposed contiguous to the photochromic coating 106. The outer surface 110 of the UV blocking layer 102 is considered the outside of the housing while the inside surface 112 of the transparent colored layer 108 is the inside of the housing in which items (not shown) may be contained. Undesired UV radiation such as sunlight striking the surface 110 will not penetrate beyond the UV blocking coating 102 to the photochromic coating 106. However, a user of the device viewing the outer surface 110 will view the color presented by the colored layer 108 since the UV blocking coating 102, support layer 104, and photochromic coating 106 are transparent to frequencies in the visual range of approximately 400 to 780 nanometers. Note that the colored layer 108 is optional, in which case the housing 100 is transparent, enabling the contents of the housing 100 to be viewed.
Referring to
Instead of the light sources 122, 322, a fourth alternate exemplary embodiment includes a door, or sealable opening, that may be opened to allow sunlight to enter, striking the photochromic coatings 106, causing it to change colors and/or pattern.
Referring to
There are many variations to the above described embodiments. As mentioned, the colored layer 108 is optional (the housing may be transparent or the color may integrated within the transparent support layer 106) and may be disposed on either side of the support layer 104 or the photochromic coating 106. The photochromic coating 106 may be disposed on either side of the support layer 104 or may be integrated within the support layer 104. The disposition of the patterned layer 330 is also variable as long as it is disposed between the photochromic coating 106 and the source of radiation.
Although the housing 100, 300 described herein may be used to house many types of devices,
A sixth embodiment includes disposing an LED so as to irradiate only of a portion of the housing 100, 300. For example, referring to the device 800 shown in
The exemplary embodiments described herein provides an easy, inexpensive way for users to irreversibly customize the appearance of a device's housing, while requiring little or no power requirements.
While at least one exemplary embodiment has been presented in the foregoing detailed description, it should be appreciated that a vast number of variations exist. It should also be appreciated that the exemplary embodiment or exemplary embodiments are only examples, and are not intended to limit the scope, applicability, or configuration of the invention in any way. Rather, the foregoing detailed description will provide those skilled in the art with a convenient road map for implementing an exemplary embodiment of the invention, it being understood that various changes may be made in the function and arrangement of elements described in an exemplary embodiment without departing from the scope of the invention as set forth in the appended claims.
Claims
1. A housing comprising:
- a photoreactive material that selectively and irreversibly changes colors upon exposure to activating radiation; and
- an ultraviolet attenuation coating disposed over the photoreactive material.
2. The housing of claim 1 wherein the photoreactive material is disposed one of on or within a transparent support layer.
3. The housing of claim 1 wherein the photoreactive material comprises a 1,2-dihydroquinoline and polymer matrix.
4. The housing of claim 1 wherein the ultraviolet attenuation coating absorbs substantially all ultraviolet radiation from sunlight and the housing further comprises:
- an activating radiation source for affecting a change in color of the photoreactive material.
5. The housing of claim 5 wherein the activating radiation source comprises a light emitting diode.
6. The housing of claim 5 wherein the activating radiation source comprises a sealed opening in the housing that is selectively unsealed to allow sunlight to affect the change in color of the photoreactive material.
7. The housing of claim 1 further comprising a patterned layer disposed between the ultraviolet attenuation coating and the photoreactive material.
8. The housing of claim 1 further comprising background color material disposed contiguous to the photoreactive material.
9. The housing of claim 1 wherein the ultraviolet attenuation coating absorbs substantially all ultraviolet radiation from sunlight and the housing further comprises:
- a plurality of activating radiation sources, each for affecting a change in color of an associated portion of the photoreactive material.
10. A housing comprising:
- a transparent support layer having first and second sides;
- an ultraviolet attenuation material disposed one of contiguous to the first side or within the transparent support layer; and
- a photoreactive coating comprising a material that irreversibly changes colors upon exposure to activating radiation, and disposed on one of the first and second sides when the ultraviolet blocking material is disposed contiguous to the first side, and disposed on the second side when the ultraviolet blocking material is disposed within the transparent support layer.
11. A method of changing the appearance of a housing including a photoreactive material, comprising:
- selectively applying activating radiation to the photoreactive material to irreversibly change the color of the photoreactive material.
12. The method of claim 11 wherein the housing further includes a patterned layer and the applying step comprises:
- selectively applying the activating radiation through the patterned layer to create a pattern within the photochromic material.
13. The method of claim 11 wherein the housing further includes a background color layer disposed adjacent the transparent support layer.
14. The method of claim 11 wherein the transparent support layer comprises a background color.
15. The method of claim 11 wherein the photochromic material is integrated within the transparent support layer.
16. The method of claim 11 wherein the applying step comprises applying activating radiation to a 1,2-dihydroquinoline/polymer matrix.
17. The method of claim 11 wherein the applying step comprises applying the activating radiation by a plurality of activating radiation sources, each to a distinct portion of the photochromic coating.
18. The method of claim 11 wherein the photochromic material comprises a blocking layer disposed over the transparent support layer.
19. The method of claim 11 wherein the photochromic material comprises an attenuation layer disposed over the transparent support layer.
Type: Application
Filed: Apr 29, 2008
Publication Date: Oct 29, 2009
Patent Grant number: 8158224
Applicant: MOTOROLA, INC. (Schaumburg, IL)
Inventors: Ruth Yu-Ai Zhang (Gilbert, AZ), Roger Ady (Chicago, IL), Rick Latella (Woodstock, IL), Louis J. Lundell (Buffalo Grove, IL), Manuel Oliver (Scottsdale, AZ)
Application Number: 12/111,665
International Classification: G03F 7/26 (20060101); B31B 45/00 (20060101);